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Week12 bucket sort
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bucket sort kotlin
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Week12 bucket sort
1.
Week12. Bucket Sort O
(n) 입력이 균등 분포라고 가정 버킷 단위로 나누고, 정렬해 잇자 입력의 범위가 균등한 입력 A n개의 버킷으로 나누어 정렬 입력이 균등하다면 버킷당 정렬 시간은 O(1)에 가까워 질 것이다
2.
Bucket Sort Time
Complexity & Pseudocode 1 2 3 4 O(n) 버킷 초기화 O(n) 해당하는 버킷에 원소 넣기 n * O(2-1/n) = θ(n) 버킷마다 삽입 정렬 O(n) 버킷들 잇기 θ(n) + n * O(2-1/n) = θ(n) (버킷별 원소 개수)2
3.
Bucket Sort Kotlin fun
bucketSort(A: List<Double>) { val size = A.size val bucket = Array<ArrayList<Double>>(size) { ArrayList() } A.forEachIndexed { index, t -> bucket[Math.floor(size.toDouble() * A[index]).toInt()] } bucket.forEach { it.insertionSort { d1, d2 -> d1 > d2 } } for(i in 1 until size) { bucket[0].addAll(bucket[i]) } }
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